Inflation. We hear about it an awful lot. But what’s it actually mean? What causes it? And why is grandpa always complaining about stuff getting more expensive? Josh Kurz explains it all in this two-part video.

This 3 part video was commissioned by KQED as part of a series that introduces the concept of percentages. Part 1 covers the basics: what the concept means, how it is applied, and some examples. Part 2 covers discounts and sales: how percentages are applied to things like shoes and olive oil. Part 3 covers combining percentages: how discounts get added.